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Accumulator

Inactive Publication Date: 2009-03-12
BORGWARNER TORQ TRANSFER SYSTEMS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0030]The accumulator of the present invention leads to several advantages over prior art, such as very fast response, since the accumulator functions as a capacitor in an electric circuit, almost unlimited delivery time of nearly maximum hydraulic pressure, if an intermittently operated pump interacts with the accumulator, and the possibility of reducing the pump size, if intermittent operation and reduced maximum pressure is utilized. The last effect comes from the built-in pressure reduction in the accumulator, which prevents the pump from pumping against a filled accumulator, until the pressure-overflow valve has opened.

Problems solved by technology

This may result in an unnecessarily high load being imposed on the pump and the motor, as the pump will pump against a filled accumulator.

Method used

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Embodiment Construction

[0012]Below, several embodiments of the invention will be described with references to the drawings. These embodiments are described for illustrative purposes only, in order to enable a skilled person to carry out the invention and to disclose the best mode. However, such embodiments do not limit the invention. Moreover, other combinations of the different features are possible within the scope of the invention.

[0013]An accumulator 100 according to an embodiment of the present invention is shown in a sectional view in FIG. 1, mounted in a housing 200. The accumulator 100 includes, in the shown embodiment, a body comprising three parts, namely a liner 110, a spacer 120 and a lid 130, all being substantially cylindrical having a substantially circular cross-section. The liner 110 cooperates with a piston 140, which is adapted for reciprocating movement within the liner 110.

[0014]The liner 110 is formed with one or several outlet ports 111, see FIG. 2, which are located in a sidewall 1...

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PUM

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Abstract

An accumulator for a hydraulic system, wherein the accumulator comprises a liner, a piston and a housing, that defines a pressure chamber, for receiving hydraulic fluid at high pressure, wherein the piston is biased towards an end position of the pressure chamber for interacting with the hydraulic fluid in the pressure chamber, and the piston is movable in a predetermined range for accumulating hydraulic fluid. The accumulator has at least one outlet port in a sidewall of the liner, which outlet port is covered by the piston in the predetermined range and is uncovered when the piston has moved a predetermined distance from the end position. A hydraulic system is also provided that comprises the above accumulator and an all-wheel drive system comprising the above hydraulic system. A method for de-airing an accumulator according to above is also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of pending International patent application PCT / EP2007 / 050565 filed on Jan. 19, 2007 which designates the United States and claims priority from Swedish patent application 0600524-3 filed on Mar. 10, 2006, the content of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to an accumulator for a hydraulic system and a method of de-airing a hydraulic system comprising such an accumulator. It furthermore relates to a hydraulic system and an all-wheel drive system incorporating said hydraulic system.BACKGROUND OF THE INVENTION[0003]Hydraulic systems are normally equipped with a pump that provides high-pressure oil to actuators and control valves. An accumulator can be connected to the high-pressure side where it inter alia can serve to remove pressure fluctuations in the hydraulic system. The pressure at the high-pressure side should be limited, though,...

Claims

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Application Information

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IPC IPC(8): F16L55/04F16D31/02
CPCF15B1/021F15B1/04F15B21/044F15B2201/413F15B2201/31F15B2201/4053F15B2201/411F15B2201/21F15B1/24B60K17/34
Inventor DAVIDSSON, PER-OLOF
Owner BORGWARNER TORQ TRANSFER SYSTEMS AB
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